Welded steel pipe refers to the steel strip or steel plate bending deformation of the shape of the round, square and other welded into the surface of the pipe. The billet used in welded steel pipe is steel plate or strip.

Since the 1930s, with the rapid development of high quality strip rolling production and the progress of welding and inspection technology, the weld quality has been increasing, the variety specifications of welded steel pipe are increasing, and more and more fields have replaced the seamless steel tube. Welded steel pipe is lower cost and higher production efficiency than seamless steel tube.

During the "Eleven-Five" period, China's oil and gas pipeline construction continued to develop rapidly, especially with the rapid increase of natural gas demand, the gas pipeline became the keystone of pipeline construction. To the end of "Eleven-Five", our country accelerates the distribution of oil and gas pipe network, and the oil and gas backbone pipe network covering the whole country has been preliminarily built, and the future of our country's oil and gas supply will be strengthened. Data show that as of the end of 2010, the total length of oil and gas pipelines in China is about 85,000 km, of which 45,000 km of natural gas pipelines, crude oil pipelines 22,000 km, oil pipeline 18,000 kilometers, forming a trans-east, north-south, covering the whole country, connected overseas oil and gas pipeline network pattern.

As China continues to increase the investment and construction of oil and gas pipelines, "Twelve-Five" period of oil and gas pipelines with Ssaw year demand more than 5 million tons, lsaw annual demand of more than 2 million tons.